请问一下，这里scss出现了编译的错误

来源：2-12 泛型（Generics）第三部分 - 类和接口

慕慕0439991

2021-03-23

尊敬的张老师，您好，今天我在学习scss写作的时候，出现了这样的错误，

× ｢wdm｣: ERROR in ./src/App.global.scss (./node_modules/css-loader/dist/cjs.js??ruleSet[1].rules[4].use[1]!./node_modules/sass-loader/dist/cjs.js!./src/App.global.scss)
Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
SassError: Undefined variable: "$color-green".
        on line 134 of src/App.global.scss
>>               color: $color-green;

   ---------------------^
 @ ./src/App.global.scss 47:4-60:5 2:12-161 9:17-24 13:7-21 45:20-34 49:6-59:7 50:38-52 56:26-40 58:21-28 68:15-29
 @ ./src/index.tsx 8:0-27

webpack compiled with 1 error
i ｢wdm｣: Failed to compile.
Not rewriting GET /dist/renderer.dev.js because the path includes a dot (.) character.
Done in 1316.29s.